Mauget · antibiotic

Arbor-OTC: rate per inch, label facts, and uses

Arbor-OTC is the Mauget oxytetracycline capsule, the antibiotic injection for bacterial leaf scorch on oak and sycamore and for fire blight on pear and crabapple. It suppresses; it does not cure. The rate table by DBH band, the late-spring window, and what to tell the client.

Run the dose in the calculator Buy it in the app shop

Label check

1 warning

Target pest listed on labelPass

Host species listed on labelPass

Delivery method permittedPass

Timing inside application windowPass

Reapplication interval — 21 days requiredWarning

Last application was 14 days ago. Proceed with a documented override, or reschedule.

Label facts

Arbor-OTC

Manufacturer: Mauget
Active ingredient: Oxytetracycline Hydrochloride
EPA registration no.: Not an EPA-registered pesticide
Category: antibiotic
Application: trunk injection
Frequency: Per label
Retreatment interval: 365 days minimum
Protection: About 12 months
Time to effect: About 14 days

Read the Arbor-OTC label (manufacturer PDF). The label is the legal document; this page is the app's copy of it.

Application months

per label

The app does not carry a month window for this product; the pest’s treatment page sets the timing.

Rate table

Dose per tree by DBH band

Milliliters of product per tree, from the label table the app's calculator uses. Low, medium, and high are the label's pressure tiers; the treatment page for the pest says which one applies.

2 to 4

Low: 6 to 12 mL
Medium: 6 to 12 mL
High: 6 to 12 mL

5 to 7

Low: 12 to 18 mL
Medium: 12 to 18 mL
High: 12 to 18 mL

8 to 10

Low: 24 to 30 mL
Medium: 24 to 30 mL
High: 24 to 30 mL

11 to 13

Low: 30 to 36 mL
Medium: 30 to 36 mL
High: 30 to 36 mL

14 to 19

Low: 42 to 54 mL
Medium: 42 to 54 mL
High: 42 to 54 mL

20 to 24

Low: 60 to 72 mL
Medium: 60 to 72 mL
High: 60 to 72 mL

25 to 30

Low: 72 to 90 mL
Medium: 72 to 90 mL
High: 72 to 90 mL

31 to 36

Low: 90 to 108 mL
Medium: 90 to 108 mL
High: 90 to 108 mL

DBH band (in)	Low	Medium	High
2 to 4	6 to 12 mL	6 to 12 mL	6 to 12 mL
5 to 7	12 to 18 mL	12 to 18 mL	12 to 18 mL
8 to 10	24 to 30 mL	24 to 30 mL	24 to 30 mL
11 to 13	30 to 36 mL	30 to 36 mL	30 to 36 mL
14 to 19	42 to 54 mL	42 to 54 mL	42 to 54 mL
20 to 24	60 to 72 mL	60 to 72 mL	60 to 72 mL
25 to 30	72 to 90 mL	72 to 90 mL	72 to 90 mL
31 to 36	90 to 108 mL	90 to 108 mL	90 to 108 mL

Worked examples

Dose per tree

Arbor-OTC

8″ DBH

24 to 30 mL low, 24 to 30 mL medium, 24 to 30 mL high (label band 8 to 10 in)

Arbor-OTC

14″ DBH

42 to 54 mL low, 42 to 54 mL medium, 42 to 54 mL high (label band 14 to 19 in)

Arbor-OTC

24″ DBH

60 to 72 mL low, 60 to 72 mL medium, 60 to 72 mL high (label band 20 to 24 in)

For the tree in front of you, with injection sites and the pest tier applied, use the tree injection rate calculator.

Labeled uses

What the label covers

Treatment guides that use Arbor-OTC

Target pests and diseases on the label (36)

Alternaria Leaf Spot · Ash Yellows · Bacterial Black Spot · Bacterial Blight · Bacterial Canker · Bacterial Leaf Scorch · Bacterial Leaf Spot · Bacterial Spot · Botryosphaeria Canker · Brown Rot · Butternut Canker · Canker Diseases · Cercospora Leaf Spot · Cherry Leaf Spot · Citrus Canker · Coconut Lethal Yellowing · Crown Gall · Cytospora Canker · Elm Yellows · Entomosporium Leaf Spot · Fire Blight · Hypoxylon Canker · Leaf Blight · Leaf Scorch · Leaf Spot · Lethal Bronzing (Palm) · Lethal Yellowing · Nectria Canker · Pear Decline · Pine Pitch Canker · Seiridium Canker · Tar Spot · Walnut Blight · Wetwood/Slime Flux · Witches Broom · X-Disease

The label check runs this list against the host, the pest, the month, the dose, and the last application on the tree before a prescription goes out.

FAQ

Questions arborists ask

What is Arbor-OTC?

Arbor-OTC is a antibiotic from Mauget with Oxytetracycline Hydrochloride as the active ingredient. It is applied by trunk injection.

What is the Arbor-OTC rate per inch of DBH?

The label sets the dose by DBH band, not a flat rate per inch. A 8 inch tree takes 24 to 30 mL low, 24 to 30 mL medium, 24 to 30 mL high (label band 8 to 10 in). The PHC Rx calculator reads the band for the tree in front of you and sets the number of injection sites.

How often can Arbor-OTC be applied?

Minimum retreatment interval 365 days. Expected protection about 12 months. Time to effect about 14 days.

What does Arbor-OTC treat?

The label lists 36 target pests or diseases. The treatment guides on this site that use it: bacterial leaf scorch, fire blight. Each guide has the rate, the timing window, and the alternatives.

Where do these numbers come from?

The PHC Rx product catalog, built from the Arbor-OTC label linked above, and synced to this page from the app. The label is the legal document; if the two disagree, the label wins and the catalog gets fixed.

Arbor-OTC: rate per inch, label facts, and uses

Arbor-OTC

Dose per tree by DBH band

Dose per tree

What the label covers

Questions arborists ask

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